CN108007750B - Test piece for measuring and calculating heat penetration time of titanium alloy blank - Google Patents
Test piece for measuring and calculating heat penetration time of titanium alloy blank Download PDFInfo
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- CN108007750B CN108007750B CN201711290131.8A CN201711290131A CN108007750B CN 108007750 B CN108007750 B CN 108007750B CN 201711290131 A CN201711290131 A CN 201711290131A CN 108007750 B CN108007750 B CN 108007750B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention belongs to the field of titanium alloy forging processing and heat treatment, and relates to a test piece for measuring and calculating the heat penetration time of a titanium alloy blank. It includes test block (2) and test bar (3), and the cross sectional shape of test block (2) is: the test bar (3) is a cylindrical shaft and is round, square, regular hexagon or regular octagon. The invention provides a test piece for measuring and calculating the heat penetration time of a titanium alloy blank, which greatly improves the measurement and calculation precision; the assembly operation is simplified, and the method is convenient to implement in production.
Description
Technical Field
The invention belongs to the field of titanium alloy forging processing and heat treatment, and relates to a test piece for measuring and calculating the heat penetration time of a titanium alloy blank.
Background
The titanium alloy has the excellent properties of light weight, high strength and corrosion resistance, and is an important structural material in the fields of aviation, aerospace, navigation and the like. With the improvement of the research and application level of titanium alloy in China, the application field and range of the titanium alloy are continuously expanded, and the brands, types, structural forms, sizes and the like of titanium alloy parts are more and more abundant. Therefore, aiming at the performance requirements of different titanium alloy workpieces, a thermal mechanical treatment process needs to be established in a more targeted manner, so that the uniformity of workpiece tissues and the stability of performance are realized, the process development and test cost is reduced, and the benefit is improved. The heat preservation time under different heating systems is one of the more important process parameters of the titanium alloy blank thermomechanical treatment process. Different geometrical shapes, different sizes or different grades of blank forms have larger difference in heating and heat preservation time. How to accurately measure and calculate the heat preservation time is very important for the structural uniformity of the titanium alloy blank and the fine control of the structure. For example, in titanium alloy articles prepared by beta forging or quasi-beta forging, the heating time before forging is required to ensure the completion of the transformation of the core structure and the homogenization of the compositions of the micro-regions of the blank, and to avoid the excessive growth of the beta phase. Therefore, the heating time needs to be controlled in a reasonable interval. For this reason, it is necessary to determine the exact penetration time for blanks of different geometries and dimensions.
Chinese patent 'method for determining heating time of TC17 titanium alloy blank in heat treatment furnace' (201510995923.X) discloses a temperature measuring device for a punching embedded thermocouple of a cylindrical bar, which realizes real-time monitoring of temperature in a hole and on the outer wall. The disadvantages are that: firstly, the measurement and calculation precision is poor, and errors caused by the fact that the thermal conductivity of a thermocouple is far higher than that of a titanium alloy blank cannot be eliminated; only the time of reaching the temperature can be given, and whether the blank is completely heated or not can not be directly judged, namely whether the core tissue transformation of the blank is completed or not can not be directly known; secondly, the assembly operation between the temperature measuring device and the heat treatment furnace is complex and the implementation is inconvenient.
Disclosure of Invention
The purpose of the invention is: the test piece for measuring and calculating the heat penetration time of the titanium alloy blank is provided, so that the measuring and calculating precision is improved; the assembly operation is simplified, and the method is convenient to implement in production.
The technical scheme of the invention is as follows: a test piece for measuring and calculating the heat penetration time of a titanium alloy blank is characterized in that: it includes test block 2 and test bar 3, and the cross sectional shape of test block 2 is: the test block 2 is round, square, regular hexagon or regular octagon, a central hole with the diameter of D is arranged on the upper end surface and the lower end surface, and the central hole is a unthreaded hole or a threaded hole; when the central hole is a unthreaded hole, D is 6-20 mm; when the central hole is a threaded hole, the maximum inner diameter of the threaded hole is D; when the test block 2 is a cylinder, the height H of the test block 2 is larger than the diameter of the cross section of the test block 2; when the test block 2 is a regular prism, the height H of the test block 2 is larger than the diameter of an inscribed circle of the cross section of the test block 2; the test rod 3 is a cylindrical shaft, and when the central hole of the test block 2 is a unthreaded hole, the outer diameter of the test rod 3 is in interference fit with the central hole of the test block 2; when the central hole of the test block 2 is a threaded hole, the outer cylindrical surface of the test rod 3 is provided with an external thread, and the external thread of the test rod 3 is screwed into the threaded hole of the central hole of the test block 2; the upper end of the test bar 3 is higher than the upper end face delta H of the test block 2, the lower end of the test bar 3 is lower than the lower end face delta H of the test block 2, and the delta H is 10 mm-100 mm; the material of the test block 2 and the test bar 3 is the same as that of the tested titanium alloy blank, and the content of the equiaxial primary alpha phase in the structure of the test bar 3 is not less than 70 percent.
The invention has the advantages that: the test piece for measuring and calculating the heat penetration time of the titanium alloy blank is provided, and the measuring and calculating precision is greatly improved; the assembly operation is simplified, and the method is convenient to implement in production.
Drawings
FIG. 1 is a schematic view of the structure of a test piece according to the present invention.
Fig. 2 is a top view of fig. 1.
Detailed Description
The present invention is described in further detail below. Referring to fig. 1 and 2, a test piece for measuring and calculating the heat penetration time of a titanium alloy blank is characterized in that: it includes test block 2 and test bar 3, and the cross sectional shape of test block 2 is: the test block 2 is round, square, regular hexagon or regular octagon, a central hole with the diameter of D is arranged on the upper end surface and the lower end surface, and the central hole is a unthreaded hole or a threaded hole; when the central hole is a unthreaded hole, D is 6-20 mm; when the central hole is a threaded hole, the maximum inner diameter of the threaded hole is D; when the test block 2 is a cylinder, the height H of the test block 2 is larger than the diameter of the cross section of the test block 2; when the test block 2 is a regular prism, the height H of the test block 2 is larger than the diameter of an inscribed circle of the cross section of the test block 2; the test rod 3 is a cylindrical shaft, and when the central hole of the test block 2 is a unthreaded hole, the outer diameter of the test rod 3 is in interference fit with the central hole of the test block 2; when the central hole of the test block 2 is a threaded hole, the outer cylindrical surface of the test rod 3 is provided with an external thread, and the external thread of the test rod 3 is screwed into the threaded hole of the central hole of the test block 2; the upper end of the test bar 3 is higher than the upper end face delta H of the test block 2, the lower end of the test bar 3 is lower than the lower end face delta H of the test block 2, and the delta H is 10 mm-100 mm; the material of the test block 2 and the test bar 3 is the same as that of the tested titanium alloy blank, and the content of the equiaxial primary alpha phase in the structure of the test bar 3 is not less than 70 percent.
In order to further improve the measurement and calculation precision, a high-temperature anti-oxidation coating 1 is coated at the gap between the test bar 3 and the port of the central hole. The high-temperature anti-oxidation coating is produced by Beijing Tianli Chuang.
Example 1
The test piece for measuring and calculating the heat penetration time of the TC4 titanium alloy cylindrical blank with the diameter of 500mm consists of a test block 2 and a test rod 3, wherein the test block 2 and the test rod 3 are both made of TC4 titanium alloy, and the content of equiaxial primary alpha phase in the structure of the test rod 3 is 70%. The cross section of the test block 2 is a circle with the diameter of 500mm, the height H of the test block 2 is 550mm, a central unthreaded hole which penetrates through the upper end face and the lower end face and has the hole diameter D is arranged on the test block 2, and D is 20 mm; the test rod 3 is a cylindrical shaft, the outer diameter of the test rod 3 is in interference fit with the central hole of the test block 2, and after the interference fit, the delta H is 100 mm. Coating high-temperature anti-oxidation coating produced by Beijing Tianli Chuang at the gap between the test bar 3 and the port of the central hole.
Example 2
The test piece for measuring and calculating the heat penetration time of the TC6 titanium alloy cylindrical blank with the diameter of 100mm consists of a test block 2 and a test rod 3, wherein the test block 2 and the test rod 3 are both made of TC6 titanium alloy, and the content of equiaxial primary alpha phase in the structure of the test rod 3 is 75%. The cross section of the test block 2 is a circle with the diameter of 100mm, the height H of the test block 2 is 150mm, a central unthreaded hole which penetrates through the upper end face and the lower end face and has the hole diameter D is arranged on the test block 2, and D is 6 mm; the test rod 3 is a cylindrical shaft, the outer diameter of the test rod 3 is in interference fit with the central hole of the test block 2, and after the interference fit, the delta H is 10 mm. Coating high-temperature anti-oxidation coating produced by Beijing Tianli Chuang at the gap between the test bar 3 and the port of the central hole.
Example 3
The test piece for measuring and calculating the heat penetration time of the TA19 titanium alloy regular quadrangular blank with the cross section inscribed circle diameter of 400mm consists of a test block 2 and a test rod 3, wherein the test block 2 and the test rod 3 are both made of TA19 titanium alloy, and the content of equiaxial primary alpha phase in the structure of the test rod 3 is 80%. The cross section of the test block 2 is a square with an inscribed circle diameter of 400mm, the height H of the test block 2 is 420mm, a central unthreaded hole which penetrates through the upper end face and the lower end face and has a hole diameter D is formed in the test block 2, and D is 12 mm; the test rod 3 is a cylindrical shaft, the outer diameter of the test rod 3 is in interference fit with the central hole of the test block 2, and after the interference fit, the delta H is 40 mm. Coating high-temperature anti-oxidation coating produced by Beijing Tianli Chuang at the gap between the test bar 3 and the port of the central hole.
Example 4
The test piece for measuring and calculating the heat penetration time of the TA15 titanium alloy regular hexagonal prism-shaped blank with the cross section inscribed circle diameter of 300mm consists of a test block 2 and a test rod 3, wherein the test block 2 and the test rod 3 are both made of TA15 titanium alloy, and the content of equiaxial primary alpha phase in the structure of the test rod 3 is 85%. The cross section of the test block 2 is a regular hexagon with an inscribed circle diameter of 300mm, the height H of the test block 2 is 400mm, a central threaded hole which penetrates through the upper end face and the lower end face and has a hole diameter D is formed in the test block 2, and D is 10 mm; the test rod 3 is a cylindrical shaft, an external thread is arranged on the outer cylindrical surface of the test rod 3, the external thread of the test rod 3 is screwed into the threaded hole of the central hole of the test block 2, and after the test rod is matched with the threaded hole, the diameter of the test rod is 50 mm. Coating high-temperature anti-oxidation coating produced by Beijing Tianli Chuang at the gap between the test bar 3 and the port of the central hole.
Example 5
The test piece for measuring and calculating the heat penetration time of the TC11 titanium alloy regular octagonal prism-shaped blank with the cross section inscribed circle diameter of 200mm consists of a test block 2 and a test rod 3, wherein the test block 2 and the test rod 3 are both made of TC11 titanium alloy, and the content of equiaxial primary alpha phase in the structure of the test rod 3 is 90%. The cross section of the test block 2 is a regular octagon with an inscribed circle diameter of 200mm, the height H of the test block 2 is 250mm, a central threaded hole which penetrates through the upper end face and the lower end face and has a hole diameter D is formed in the test block 2, and D is 8 mm; the test rod 3 is a cylindrical shaft, an external thread is arranged on the outer cylindrical surface of the test rod 3, the external thread of the test rod 3 is screwed into the threaded hole of the central hole of the test block 2, and after the test rod is matched with the threaded hole, the diameter of the test rod is 25 mm. Coating high-temperature anti-oxidation coating produced by Beijing Tianli Chuang at the gap between the test bar 3 and the port of the central hole.
Claims (2)
1. A test piece for measuring and calculating the heat penetration time of a titanium alloy blank is characterized in that: it includes test block (2) and test bar (3), and the cross sectional shape of test block (2) is: the test block (2) is provided with a central hole which penetrates through the upper end face and the lower end face and has a hole diameter D, and the central hole is a unthreaded hole or a threaded hole; when the central hole is a unthreaded hole, D is 6-20 mm; when the central hole is a threaded hole, the maximum inner diameter of the threaded hole is D; when the test block (2) is a cylinder, the height H of the test block (2) is larger than the diameter of the cross section of the test block (2); when the test block (2) is a regular prism, the height H of the test block (2) is larger than the diameter of an inscribed circle of the cross section of the test block (2); the test rod (3) is a cylindrical shaft, and when the central hole of the test block (2) is a unthreaded hole, the outer diameter of the test rod (3) is in interference fit with the central hole of the test block (2); when the center hole of the test block (2) is a threaded hole, the outer cylindrical surface of the test rod (3) is provided with an external thread, and the external thread of the test rod (3) is screwed into the threaded hole of the center hole of the test block (2); the upper end of the test bar (3) is higher than the upper end surface delta H of the test block (2), the lower end of the test bar (3) is lower than the lower end surface delta H of the test block (2), and the delta H is 10 mm-100 mm; the material of the test block (2) and the test bar (3) is the same as that of the tested titanium alloy blank, and the content of equiaxial primary alpha phase in the structure of the test bar (3) is not less than 70 percent.
2. The test piece for measuring and calculating the heat penetration time of the titanium alloy blank according to claim 1, wherein the test piece comprises: and coating a high-temperature anti-oxidation coating (1) at a gap between the test bar (3) and the port of the central hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711290131.8A CN108007750B (en) | 2017-12-07 | 2017-12-07 | Test piece for measuring and calculating heat penetration time of titanium alloy blank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711290131.8A CN108007750B (en) | 2017-12-07 | 2017-12-07 | Test piece for measuring and calculating heat penetration time of titanium alloy blank |
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| CN108007750A CN108007750A (en) | 2018-05-08 |
| CN108007750B true CN108007750B (en) | 2020-10-20 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201400694Y (en) * | 2009-03-27 | 2010-02-10 | 中南大学 | Quenching test bar for measuring through hardening depth of aluminum alloy material |
| CN101788438B (en) * | 2010-01-27 | 2011-08-17 | 湖南大学 | Experimental method for measuring harden ability of large-sized aluminium alloy |
| CN102967383B (en) * | 2012-12-18 | 2014-08-06 | 东北大学 | Method for determining temperature field of aluminum alloy along axial direction of sample during end quenching |
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Non-Patent Citations (3)
| Title |
|---|
| The Thermomechanical Processing of Alpha/Beta Titanium Alloys;S.L. Semiatin 等;《Journal of metals》;19970630;第49卷;第33-39页 * |
| 航空用钛合金研究进展;金和喜 等;《中国有色金属学报》;20150228;第25卷(第2期);第280-292页 * |
| 高强度、高韧性、高模量钛合金研究进展;敖宏 等;《金属学报》;20020930;第38卷;第22-24页 * |
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